Partial fix for issue 3124895.

When a SIP call is put on hold and no other call is active, the audio mode should not be
switched to incall.

Change-Id: I1307330f10cbfb9c4223bcb9dc4faa79778750af
diff --git a/telephony/java/com/android/internal/telephony/CallManager.java b/telephony/java/com/android/internal/telephony/CallManager.java
index ab7b601..5f9a3e7 100644
--- a/telephony/java/com/android/internal/telephony/CallManager.java
+++ b/telephony/java/com/android/internal/telephony/CallManager.java
@@ -380,7 +380,7 @@
                 break;
             case OFFHOOK:
                 Phone fgPhone = getFgPhone();
-                if (!(fgPhone instanceof SipPhone)) {
+                if (hasActiveFgCall() && !(fgPhone instanceof SipPhone)) {
                     mode = AudioManager.MODE_IN_CALL;
                 }
                 break;